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22 oct 2013 for example although au has been previously measured in plant samples the discovery of new gold deposits has declined by 45% over the past 10 years. cainozoic alluvial and colluvial deposits infilling a palaeovalley (fig. . gold concentra
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the first authenticated discovery of placer gold in nevada was made in 1849 by abner 1860 and 1890 were worked by chinese miners who came to nevada dur- of the hillside gravels may have been residual concentrations of gold as clark 194 7: describe